Method of manufacturing lanthenum oxide containing solids in an aqueous environment

Abstract

A method for processing lanthanum oxide solids in an aqueous solution. An aqueous solution containing a partially soluble or insoluble salt forming anion is provided. A soluble lanthanum oxide solid is then added to the solution, and the anion is then reacted with at least a portion of the lanthanum in the lanthanum oxide solid, thereby forming a partially soluble or insoluble salt coating around the lanthanum oxide solid.

We claim:  
     
       1. A method of manufacturing lanthanum oxide containing solids in an aqueous environment, comprising the steps of: 
       a. providing an aqueous solution containing partially soluble or insoluble salt forming anions,  
       b. adding a soluble lanthanum oxide solid selected from the group consisting of lanthanum gallates, lanthanum cobaltites, lanthanum manganites, lanthanum chromites, lanthanum ferrites, and combinations thereof, to said solution,  
       c. reacting said anions with at least a portion of the lanthanum in said lanthanum oxide solid,  
       d. thereby forming a partially soluble or insoluble salt coating around said lanthanum oxide solid.  
     
     
       2. The method of  claim 1  wherein the anions are selected from the group consisting of phosphate, carbonate, oxalate and combinations thereof. 
     
     
       3. A method of manufacturing lanthanum gallate containing solids in an aqueous environment, comprising the steps of: 
       a. providing an aqueous solution containing partially soluble or insoluble salt forming anions,  
       b. adding lanthanum gallate to said solution,  
       c. reacting said anions with at least a portion of the lanthanum in said lanthanum gallate,  
       d. thereby forming a partially soluble or insoluble salt coating around said lanthanum gallate.  
     
     
       4. The method of  claim 3  wherein the anions are selected from the group consisting of phosphate, carbonate, oxalate and combinations thereof. 
     
     
       5. A method of manufacturing lanthanum gallate containing solids in an aqueous environment, comprising the steps of: 
       a. providing an aqueous solution containing phosphate anions,  
       b. adding lanthanum gallate to said solution,  
       c. reacting said phosphate anions with at least a portion of the lanthanum in said lanthanum gallate  
       d. thereby forming a partially soluble or insoluble salt coating around